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参数资料
| 型号： | DC1018B-B |
| 厂商： | Linear Technology |
| 文件页数： | 1/26页 |
| 文件大小： | 0K |
| 描述： | DEMO BOARD FOR LT4356-2 |
| 设计资源： | DC1018B Design File DC1018B Schematic |
| 标准包装： | 1 |
| 主要目的： | 过压防护 |
| 嵌入式： | 否 |
| 已用 IC / 零件： | LT4356-2 |
| 已供物品： | 板 |
| 相关产品： | LT4356HDE-3-ND - IC REG OVP FAULT TIMER 12DFN LT4356HS-3#PBF-ND - IC REG OVP W/LATCHOFF 16SOIC LT4356HMS-3#PBF-ND - IC REG OVP W/LATCHOFF 10-MSOP LT4356HDE-3#PBF-ND - IC REG OVP W/LATCHOFF 12DFN LT4356HS-3#TRPBF-ND - IC REG OVP FAULT TIMER 16SOIC LT4356HMS-3#TRPBF-ND - IC REG OVP FAULT TIMER 10MSOP LT4356HDE-3#TRPBF-ND - IC REG OVP FAULT TIMER 12DFN LT4356MPS-2#TRPBF-ND - IC SURGE STOPPER ADJ 16-SOIC LT4356MPS-1#TRPBF-ND - IC SURGE STOPPER ADJ 16-SOIC LT4356MPMS-1#TRPBF-ND - IC SURGE STOPPER ADJ 10-MSOP 更多... |
LT4356-1/LT4356-2
Surge Stopper
FEATURES
DESCRIPTION
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Stops High Voltage Surges
Adjustable Output Clamp Voltage
Overcurrent Protection
Wide Operation Range: 4V to 80V
Reverse Input Protection to –60V
Low 7μA Shutdown Current, LT4356-1
Adjustable Fault Timer
Controls N-channel MOSFET
Shutdown Pin Withstands –60V to 100V
Fault Output Indication
Guaranteed Operation to 125°C
Auxiliary Ampli?er for Level Detection Comparator or
Linear Regulator Controller
Available in (4mm × 3mm) 12-Pin DFN,
The LT ? 4356 surge stopper protects loads from high voltage
transients. It regulates the output during an overvoltage
event, such as load dump in automobiles, by controlling
the gate of an external N-channel MOSFET. The output is
limited to a safe value thereby allowing the loads to con-
tinue functioning. The LT4356 also monitors the voltage
drop between the V CC and SNS pins to protect against
overcurrent faults. An internal ampli?er limits the current
sense voltage to 50mV. In either fault condition, a timer
is started inversely proportional to MOSFET stress. If the
timer expires, the FLT pin pulls low to warn of an impend-
ing power down. If the condition persists, the MOSFET is
turned off. After a cool down period, the GATE pin pulls
up turning on the MOSFET again.
10-Pin MSOP or 16-Pin SO Packages
APPLICATIONS
The auxiliary ampli?er may be used as a voltage detection
comparator or as a linear regulator controller driving an
external PNP pass transistor.
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Automotive/Avionic Surge Protection
Hot Swap/Live Insertion
High Side Switch for Battery Powered Systems
Intrinsic Safety Applications
Back-to-back FETs can be used in lieu of a Schottky diode
for reverse input protection, reducing voltage drop and
power loss. A shutdown pin reduces the quiescent current
to less than 7μA for the LT4356-1 during shutdown. The
L , LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
LT4356-2 differs from the LT4356-1 during shutdown by
reducing the quiescent current to 60μA and keeping alive
the auxiliary ampli?er for uses such as an undervoltage
lockout or always-on regulator.
TYPICAL APPLICATION
4A, 12V Overvoltage Output Regulator
Overvoltage Protector Regulates Output at
V IN
12V
10mΩ
IRLR2908
V OUT
27V During Transient
C TMR = 6.8μF
80V INPUT SURGE
I LOAD = 500mA
10Ω
102k
383k
V CC
SNS
GATE
OUT
V IN
20V/DIV
FB
SHDN
4.99k
V CC
12V
100k
IN +
LT4356DE
EN
DC-DC
CONVERTER
SHDN GND
V OUT
20V/DIV
12V
27V ADJUSTABLE CLAMP
UNDERVOLTAGE
A OUT
GND
TMR
FLT
4356 TA01
FAULT
100ms/DIV
4356 TA01b
0.1μF
4356fa
1
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